Self-filling sac pen



March 24, 1931.` G. swEETsER 1,798,046

SELF FILLING SAC. PEN

FiledANov. 11, 1929 Patented Mar. 24, 1931 UNITEDy STATES PATENT OFFICE GEORGE SWEETSER,r OF LONDON, ENGLAND,VASSIGNOR TO THE MENTMORE MANUFAC- TUBING COMPANY, LIMITEDl .OF LONDON, ENGLAND, A COMPANY OF GREAT BRITAIN Application led November 11, 1929, Serial No. 406,332, and in Great Britain, December 10, 1928.

This invention has relation to reservoir pensof the self filling type inV which the ink is contained in a collapsible sack which is deformed when replenishment of ink is neces- ISA sary, by pressure applied through a pressure bar.

The invention further has relation to selfilling pens of the sack type in which the lateral or deforming movement of the pressure bar is effected by the longitudinal movement of an operating bar, the two bars being openl atively connected together and the operating bar being actuated from, and by, a` button mounted in the one end of the pen barrel.

The invention has for its object to provide improvements in self filling pens of the kind referred to, whereby certain advantages are obtained. Y

In a self filling pen of the kind referred to, inl accordance with this invention, a pressure bar is anchored at one end within the pen barrel and an operating bar is disposed in parallel relationship therewith,interacting means comprising inclined planes being disposed between the two bars, and the operating bar being provided with means external to, and'at one end of, the pen barrel to impart longitudinal movement thereto and through the inclined planes lateral movement to the pressure bar.

In` one Vembodiment of the invention, the inclined Vplanes are integral with or mounted on the operating bar and engage in slots in the pressure bar, the endwise movement of the operating bar causing the inclined planes as they ride up the ends of the slots to exert a lateral thrust on the pressure bar.

In order that the invention, the object and nature of which have been set forth, may be .particularly described and ascertained, reference will now be made to the accompanying sheet of drawings on which three several embodiments are illustrated Fig. 1 is a longitudinal sectional view of one embodiment with the parts in their normal position; Fig. 2 a similar view to Fig. 1, but with the ink sack collapsed ready for filling; and

Fig. 3 a cross section on the line 8-3 ofi0 Fig. 2;

partly in secin one end the pen carrier 12 to which the ink sack 13 is attached as ordinarily. Interposed between the ink sack 13 and the inner wall of rthe pen barrel 11 aretwo pressure bars 14,

which are in opposed relationship. Each A of the pressure bars 14 is connected at one end by a springy member 15 to a collar 16, which is made in two parts and has an inwardly projecting flange 17 A part collar 16 and springy member 15 may be integral with a pressure bar 14. The collar parts 1'6 are placed to encircle that portion of the pen carrier 12 on which the ink sack 13 is mounted, the flanges 17 engaging a groove in the pen carrier 12 beyond the end of the ink sack 13. W'hen the pen carrier 12 is passed into the pen barrel 11, the collar parts 16 are retained in position by the pen barrel 11. Y The pressure bars 14 are each provided with longitudinal slots 18, two are shown.

19, 19 are operating bars these are each positioned between the inner wall of the pen barrel 11 and a pressure bar 14. The bars 19 are rounded in cross section to the inner ra-I dius ofv the pen barrel and each has, on the face which cornes adjacent a pressure bar 14, projections 20 equal in number to the slots 18.

The projections 20 enter the slots 18 and have inclined operating faces constituting the inclined planes. The inclined planes extend towards the pen carrier 12. The operating bars 1 9 have at their one ends collar parts 21 Yand flanges 22'similar to the collar parts 16 and flanges 17. The collar. parts 21 areplaced to encircle a button 24 that is mounted in the other end of the pen barrel and is a loose fit therein. The button 24 is formed -near one end with a groove 23 in which the ton 27 having a screwthreaded stem 28 to engage the inner lthreads of the stemv 25. vIn

the normal position of the parts, the ring` 26 is screwed up against the end of the pen barrel 11.

To ll the pen, the milled ring 26 is grasped' and through it a pull is exerted on the button 24 and operating bars 19. The endwise movementso imparted to the operating bars 19 causes the inclinedA planes 20 to bear against and ride up the ends of the slots 18 in the pressure bars 14. The pressure bars 14 under the action of the inclined planes 2U move towards each other and collapse the ink sack. rIhe longitudinal movement of the operating bars 19 is limited by catches 20a provided on the inclined planes 20 engaging the ends of the slots 18. rl`he ink sack 13 is allowed to return to its normal condition by pressure on the button 24 and consequent longitudinal movement in the opposite direction of the ope-rating jbars 19 and inclined planes 20. The springy members 15 assisted by the tendency o-f the ink sack to resume its normal condition ensure the return movement of the pressure bars 14.

In the embodimentillustrated in Fig. 4 the ink sack 13 comprises a. length of elastic tubing secured at one end to the pen carrier 12 and at the other end to an extension 28 on the button 24 in similar manner. 29 is a valve adapted to seat von a valve seating30 within the pen carrier 12. The valve 29 is mounted on one end of a rod 31 that extends longitudinally of and within the ink'sack 13. and is mounted at its other end in the button extension 28. When the valve29 is on its seating 30, the face ofthe button 24 that is Contiguous to the stem 25 is within the penbarrel 11. Adjustment ofthe valve 29 for increased How is made by screwing the milled' ring 26 down the stem 25: adjustment in the opposite sense is made by screwing-the milled ring 26 up `he stem 25 and endwise pressure on the button 24. W'hen filling the pen, the valve 29 is moved oftr itsseating before the button 24 is pulled endwise. i

In the embodiment illustrated Vin Figs. 5 l

and 6 the' presume bars 14 have stamped or Vpressed out portions 31l and the operating bars 19 have stamped or pressed out portions 32, the portions 32 entering the portions 3l towards one end thereof. Opposed walls of the portions 31, 32 are slotted and in the slots the ends or tongues of links 33 are received.

' rIhe one end'or tongue of a link 33 isi-nclined as indicated at 34 and engages the slot in the portion 31: the other end or tongue is in line with the link 33. The inclined part 34 forms an inclined plane. The inclined planes 34 extend in the opposite direction to the inclined planes 2O in theother embodiments. Then the operating bars 19 are moved in the direction of the arrow 35, the links 33 move therewith and as the inclined planes f combination, a pressure bar anchored at oneend within the pen barrel, an operating bar disposed in parallel relationship therewith, interacting means comprising inclined planes disposed between the two bars, and means at one end of, and external to,rthe pen/barrel to;

act on the operating bar, impart longitudinal movement thereto and throughvthe inclined planes lateral movement to the pressure bar.

2. In a self filling pen of the kind referred to, ink sack collapsing means as claimed inV claim 1, kwherein the inclined plane is carried by the 'operating bar and the pressure bar is provided with a slot in which the inclined plane enters,'the endwise movement of the operating bar causing the inclined` plane to ride on the end of the slot and exert a lateral thrust on the pressure bar.

3. In a self filling pen of the kind referred kto the combination with ink sack collapsing lmeans as claimed in claim 1, of a regulating" valve seated in the pen carrier and adjustable from the means by which the operating bar is moved longitudinally.

4. In a self filling pen of the kind referred to ink sack collapsing means as claimed inizio claim l, wherein the inclined plane constitutes the one end of a parallel motion link by which the operating and pressure bars are connected together.

Dated this 31st day of October, 1929.

GEORGE SWEETSER. 

